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What is Low-E glass?

Low-emissivity coatings reduce heat transfer through windows by limiting the amount of radiant energy they emit. Low-e glass has a microscopically thin, transparent coating – it is much thinner than a human hair – that reflects long-wave infrared energy (or heat). Low-e coatings minimize the amount of ultraviolet and infrared light that can pass through glass without compromising the amount of visible light that is transmitted.